>>reporter: huge snowstorm on the west coast continues to hit northern california hard. causing hundreds of delays and cancelling flights in and out of san francisco. with the average delay lasting over 2 hours. the high winds severe conditions have left many drivers in the sierra unable to even stay on the road. oklahoma is expected to get hit hard with snow tonight into christmas morning. complicating travel for the sooner state just three years after santa brought a record breaking 14 inches of snow on christmas eve shutting the roadway down for the evening. according to triple a more than 1 in 4 americans will take a road trip this holiday season. how festive the trip is all depends on if knots nature and father christmas can get along. tj, abc news, new york. >> well, you might want to try to avoid the warm christmas eve fire you look forward to. bay area air quality management district calls on all of us to refrain from burning wood in the fireplace ors wood stoves tonight. district is hoping to keep the air quality healthy enough so it doesn't have to call a spare